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A167281
Primes containing the string 555.
5
5557, 15551, 15559, 45553, 45557, 55501, 55511, 55529, 55541, 55547, 55579, 55589, 65551, 65557, 75553, 75557, 105557, 115553, 125551, 135559, 155501, 155509, 155521, 155537, 155539, 155557, 155569, 155579, 155581, 155593, 155599, 165551
OFFSET
1,1
LINKS
FORMULA
a(n) ~ n log n. - Charles R Greathouse IV, Nov 01 2022
MATHEMATICA
p555Q[n_] := Module[{idn=IntegerDigits[n]}, MemberQ[Partition[idn, 3, 1], {5, 5, 5}]]; Select[Prime[Range[16000]], p555Q] (* Vincenzo Librandi, Sep 15 2013 *)
CROSSREFS
KEYWORD
nonn,base
AUTHOR
Vincenzo Librandi, Nov 01 2009
STATUS
approved